下周，请继续关注第二部分，将为你介绍另外三节肩膀和背部运动。
Next week, watch for part 2, with 3 more easy exercises for shoulders and back.
翻身，背部做同样的运动。
在做任何困难的运动如跑步之前，腿、手臂、背部和脖子要有充分拉伸。
You need to stretch your legs, arms, back and neck before you do any difficult activities like running.
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